HELP- Moody Cancer

I have been seeing a Cancer man for a couple months. He got out of a long relationship and we started talking, I helped him through a lot and I had no intentions to take it any further than friends; then after talking every day for 3 months he asked me out. We hit it off great, hung out more and more, he was such a gentleman, made me laugh, talked to me all the time and wanted to hang out, stayed over all that jazz. I have some personal health issues I am going through and he has some important decisions to make and he said we just need to let each other know when these issues are bothering us or if we are having bad weeks and stressed and need space and the other person needs to accept that and not take it personal (HE brought this up). Past couple times we hung out was great we are so comfortable and goofy with each other, he surprised me came over and cooked me dinner one night, and he was all cuddles and normal. Last Friday he kissed me goodbye have a good day then like 2 hours later it was like a complete 180 he said he was in a sad/bad mood and he is like pushing me away because there is a possibility he might move. I am so caught off guard and have no idea what to do. He doesn’t want anything to change but doesn’t know if he can be in a relationship right now but he likes me and I make him happy and he enjoys our time together and he still wants to talk to me every day and hang out just us. Blows my mind what I did to make him suddenly be like this. It seems like he wants it both ways? I want to be there for him but I can’t just act like everything is fine because I liked him and we BOTH treated each other like we were dating. Finally, I just wrote him a letter and laid out everything how I felt and gave it to him yesterday. He read it right away and thanked me and that he appreciated it a lot and it was such a big gesture to take the time to write it. But he needs time to process because he is in a bad mood right now.

I guess idk where that leaves me? He still texts me and tells me about his day and problems do I just wait and hope he opens up and talks to me about the letter. Or just cut ties?

I feel he is really upfront with me and he has straight up told me it has nothing to do with his ex. But he wanted to move and then he met me and i think i am throwing off his plans. When we first went out he said he didn't want to hurt me because he might be moving but he did really like me and wanted to hang out and see where it goes...

MiZLeo i know for me being a Leo i like to be reassured too and sometimes i dont get that

FutureSeeker
Right away i didnt know how to handle his moods and i kind of got took back and had to take time for me to think and didnt really talk to him much and that was like 2 days and he came to my house and said he couldnt handle not talking to me. I guess when he tells me idk if i can do a relationship right now because certain things are holding me back which he tells me is that he might move idk how to take that. I have been keeping convo with him and he tells me his problems but how long do i wait until he addresses the letter? I dont want ot come off like everythign is fine because if he doesnt want to be i dotn want to waste my time either